Combined burglar-alarm and lock.



A. HAMELIN.

COMBINED BURGLAR ALARM AND LOCK.

APPLICATION FILED JUNE29, I9I4.

1,15%63; Patented Oct. 26, 1915.

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A. HAM ELIN. I

COMBINED BURGLAR ALARM AND LOCK.

APPLICATION FILED JUNE 29. 1914.

1,157,868. Patented Oct. 26, 1915.

2 SHEETS-SHEET 2.

INVENTOR WITNESSES fl/Wf L/A/ coumnm PLANOCIRAPH 60., WASHINGTON, mv c.

UNTTEU dTrtTEd PATENT @FFTFE.

ALBAN HAMELIN, MONTREAL, QUEBEC, CANADA, ASSIGNOB. OF ONE-HALF TO HAMLAUS PATENTS COMPANY, OF MONTREAL, QUEBEG, CANADA.

COMBINED BURGLAR-ALARM AND LOCK.

menses.

Specification of Letters Patent.

Patented Got. 26, 1915..

Application filed June 29, 1914. Serial N 0. 848,078.

To all whom it may concern.

Be it known that I, ALBAN HAMELIN, a subject of the King of Great Britain, and residing at the city of Montreal, in the Province of Quebec, Canada, mechanic, have invented certain new and useful Improvements in Combined Burglar -Alarms and Locks; and I do hereby declare that the following is a full, clear, and exact description of the same.

The invention relates to a combined burglar alarm and lock and the object of the invention is to apply to an ordinary electric bell arrangement a locking device for a door, window, or the like which, besides locking the door will come into operation to ring the bell, if an attempt is made to open the door.

The invention is shown in the accompanying drawings in which- Figure 1 illustrates an inside view of a door and frame with the invention applied thereto. Fig. 2 is a horizontal sectional view of aflportion of a door and frame in closed position with the invention applied thereto. Fig. 3 is a similar view to Fig. 2, but showing the position of the parts when an attempt is made to open the door. Fig. 4 is a perspective view of the invention approximately full size. Fig. 5 shows the invention applied to a sliding window and Fig. 6 is a section on the dotted line AB Fig. 5.

Referring to the drawings, it will be seen that the lock comprises a staple 1 carried by a base plate 2 rigidly secured to the frame 3 of the door, said staple cooperating with a bolt or latch member 4 carried by a plate 5 rigidly secured to the door 6. It is preferred to pivotally mount the latch 4 in a knuckle 7 as indicated by the numeral 8 and which in turn is swiveled to the center of the plate 5 as indicated by the numeral 9, thus permitting the bolt or latch 4 to be swung over into engagement with the staple when it is desired to lock the door. The purpose of the pivotal connection 8 will be seen hereinafter.

The staple 1 is provided with a notch 10 having a rightangular extension 11, while the latch 4 is also provided with a notch 12 which reduces its width to an extent just sufiicient to permit it to enter the notch 10. The locking arrangement will now be clearly understood for the latch 4 is swung over from the disengaging position shown in F g. 4 to. the engaging position shown in Fig. 2 thus, like an ordinary latch and staple, locking the door in its closed position. A little play however is allowed by reason of the staple notch extension 11 which permits the door to be opened a little Way as shown in Fig. 3 in which case, the reduced portion of the latch adjacent to the notch 12 enters the extension 11.

The plate 2 carries a terminal while the outer end of the staple 1 supports a contact plate 14 insulated from the staple by an insulating block 15. An electric wire 16 is connected to the terminal 13 while another wire 17 is connected to the terminal 18 of the plate 14. The wires 16 and 17 may be shunt wires from the ordinary electric bell circuit 18 or they may be part of a special bell circuit. The preferable form however is to combine the device with an ordinary electric bell circuit which includes the usual electric push button 19 outside the door.

When the latch 4 is thrown over into ingagement with the staple, and the door is in its closed position, no electric contact is made, but the latch rests on the staple in the notch 12 in a position clear of the contact plate 14, but when an attempt is made to open the door and it is forced open a short distance as shown in Fig. 3, the outer end of the latch reaches the inner edge of the contact plate .15, thus joining the circuit between'the staple and the plate 14 and cansing the bell 20 to ring. If an attempt is now made to swing the latch out of position by inserting a knife through the opening of the door, the attempt will fail as the latch is prevented from swinging on the pivot 9 owing to its position in the extension 11. The pivot 8 performs an important function for the natural procedure of a burglar would be to immediately reclose the door after hearing the electric alarm, but the pivot 8 permits the outer end of the latch to lag behind and stay in the notch 11 when the door is reclosed, therefore the alarm will continue to ring and the door remains locked.

It must be particularly noticed that in the present invention no additional switch is needed to cut out the alarm when it is not desired to use it. The latch itself forms the switch as well as the look, so that when the lock is on, the switch is closed and vice versa,

While the invention hasbeen described in connection with a door and its frame, it will" be obvious that itrcan bejust as easily applied to windows particularly'French windows, the essential feature being a latch and staple adapted to lock two relatively movable elements in their closed position,

as claimed in the followingeclaims for novelty. v

In Figs. 5 and 6 showing the invention to a win'dow'of the sliding sash type, the principle is the same asthat hereinbefore described, eXcept that the staple is movable .into engagement with the bolt inthis case. 21 indicates the sash vertically slidable'in the frame 22. 23 indicates the :staple hin'ged'to a supporting plate EZ Irigidly secured to the inner side edge of the frame. 25 indicates the bolt which is fixedly supported on a supporting plate 26 rigidly securedto the sash 21, said bolthaving a hooked end 27. adapted to pass through a slot 28 in the staple 23, when the latter is swung forward to the locking position. The staple carries a contact plate 29 insulated therefrom and having a terminal 30 to which oneof the circuit wires is connected,

the other circuit wire being connected to the staple by a terminalBl. l/Vhen an attempt is made to raise'the 'sashthe hooked end 27 meets the contact 29 and joins the circuit betweensaid contact and'the staple, thus ringing the alarm while the hooked end. is in such aposition as to prevent the staple being swung back.

What I claim is 1. In a device of the class described, a bolt and a staple adapted to mutually engage and disengage,said bolt and staple being. respectively secured to two relatively movable elements having means for interlocking, means between said bolt and staple permittinga slight'relative movement and an electric. alarm device adapted to be brought intov operation bysaid relative V movement.

2. In a device of the class described, a latch and a'staple adapted-to lock two relatively movable elements, the-engagement of said latch and staple being such that a Copies of this'patent may be obtainedfor limited relative'movement is permitted between said elements, electric alarm devices connected to said staple and adapted to come into operationto sound an alarm when the combination with two relatively movable elements, of a staple secured to one of said elements and a latch secured to the other element, said latch adapted to be swung into engagement-with said staple to lock the two elements ina closed position, the means of engagement'between said latch and staple permitting a limited relative movement of said elements, a contact carried by said stapleand insulated therefrom, an electric terminal carried by said staple, an electric terminal 011 said-plate, bell circuit wires connected to said terminals, and an electric bell in said circuit, said contact being touched by the latch to ring the alarm only when the aforesaid limited movement takes place, and a pivotal connection between the inner end of said latch and its support whereby the outer end of the latch remains in contactingposition when the elements are reclosed after having reached the limited movement position.

4. In a device of the class described, the combination with two relatively movable elements, of a staple rigidly secured to one of said elements and having a slot in its upper edge with a right angular extension, a latch adapted to enter said staple notch, a supporting plate for said latch rigidly secured'to the other of said elements, a knuckle swivelly connected'to said supporting plate and a .pivotal connection between said knuckle and the inner end of said l atch, said staple and latch being adapted to lock said elements in a closed position allowing a slight relative movement by reason of said notch extension, a contact plate carried by said staple and insulated therefrom, an electric terminal carried by said staple, an electric. terminal on said plate, bell circuit wires connectedto saidterminals and an electric bell in said circuit, said contact being touched by the-latch to ring the alarmonly when the aforesaid limited movement takes place.

Signed at Montreal, Quebec, anada, this 23rd day of April, 1914;.

ALB'AN I HAMELIN.

Vl itnesses M. 'PATENAUDE, C. PATENAUDE.

fivecents each, by addressing the Commissioner of Patents. Washington, D. '0." i 

